29 pieces, 5 corners and a difficulty level of 10. : r/Jigsawpuzzles
Electronics | Free Full-Text | Efficient Difficulty Level Balancing in Match-3 Puzzle Games: A Comparative Study of Proximal Policy Optimization and Soft Actor-Critic Algorithms
What Are Jigsaw Puzzle Difficulty Levels?
From Beginner to Pro: Hanayama's Wide Range of Puzzle Difficulty Level – Kubiya Games
Water Sort Puzzle Level 1,000,000! Yes, ONE MILLION! 1000000! - YouTube
Amazon.com: CoolToys Build-A-Track Brain Teaser Puzzles for Kids Ages 4-8 - Educational Smart Logic Board Game for Children, 4 Levels & 100+ Skill-Building Challenges, Fun Home & Travel Boys & Girls STEM
BePuzzled | Rotor Hanayama Cast Metal Brainteaser Puzzle Mensa Rated Level 6, for Ages 12 and Up - Walmart.com